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f_wipe.pas
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f_wipe.pas
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//------------------------------------------------------------------------------
//
// DoomXS - A basic Windows source port of Doom
// based on original Linux Doom as published by "id Software"
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2021-2022 by Jim Valavanis
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//------------------------------------------------------------------------------
// Site: https://sourceforge.net/projects/doomxs/
//------------------------------------------------------------------------------
unit f_wipe;
interface
procedure wipe_StartScreen;
procedure wipe_EndScreen;
function wipe_Ticker(ticks: integer): boolean;
implementation
uses
doomdef,
d_delphi,
m_rnd,
m_fixed,
i_video,
v_video,
z_memory;
// SCREEN WIPE PACKAGE
var
wipe_scr_start: PByteArray;
wipe_scr_end: PByteArray;
procedure wipe_shittyColMajorXform(_array: PByteArray; width, height: integer);
var
x, y: integer;
dest: PByteArray;
begin
dest := Z_Malloc(width * height, PU_STATIC, nil);
for y := 0 to height - 1 do
for x := 0 to width - 1 do
dest[x * height + y] := _array[y * width + x];
memcpy(_array, dest, width * height);
Z_Free(dest);
end;
var
yy: Pfixed_tArray;
vy: fixed_t;
procedure wipe_initMelt;
var
i, r: integer;
SHEIGHTS: array[0..SCREENWIDTH - 1] of integer;
RANDOMS: array[0..319] of byte;
begin
for i := 0 to SCREENWIDTH - 1 do
SHEIGHTS[i] := Trunc(i * 320 / SCREENWIDTH);
for i := 0 to 319 do
RANDOMS[i] := M_Random;
// copy start screen to main screen
memcpy(screens[SCN_FG], wipe_scr_start, SCREENWIDTH * SCREENHEIGHT);
wipe_shittyColMajorXform(wipe_scr_start, SCREENWIDTH, SCREENHEIGHT);
wipe_shittyColMajorXform(wipe_scr_end, SCREENWIDTH, SCREENHEIGHT);
// setup initial column positions
// (y<0 => not ready to scroll yet)
yy := Z_Malloc(SCREENWIDTH * SizeOf(integer), PU_STATIC, nil);
yy[0] := -(M_Random mod 16);
for i := 1 to SCREENWIDTH - 1 do
begin
r := (RANDOMS[SHEIGHTS[i]] mod 3) - 1;
yy[i] := yy[i - 1] + r;
if yy[i] > 0 then
yy[i] := 0
else if yy[i] = -16 then
yy[i] := -15;
end;
// JVAL change wipe timing
vy := FRACUNIT * SCREENWIDTH div 200;
for i := 0 to SCREENWIDTH - 1 do
yy[i] := yy[i] * vy;
for i := 1 to SCREENWIDTH - 1 do
if SHEIGHTS[i - 1] = SHEIGHTS[i] then
yy[i] := yy[i - 1];
end;
function wipe_doMelt(ticks: integer): integer;
var
i: integer;
j: integer;
dy: fixed_t;
idx: integer;
s: PByteArray;
d: PByteArray;
begin
Result := 1;
while ticks > 0 do
begin
for i := 0 to SCREENWIDTH - 1 do
begin
if yy[i] < 0 then
begin
yy[i] := yy[i] + vy;
Result := 0;
end
else if yy[i] < SCREENHEIGHT * FRACUNIT then
begin
if yy[i] <= 15 * vy then
dy := yy[i] + vy
else
dy := 8 * vy;
if (yy[i] + dy) div FRACUNIT >= SCREENHEIGHT then
dy := SCREENHEIGHT * FRACUNIT - yy[i];
s := PByteArray(integer(wipe_scr_end) + i * SCREENHEIGHT + yy[i] div FRACUNIT);
d := PByteArray(integer(screens[SCN_FG]) + yy[i] div FRACUNIT * SCREENWIDTH + i);
idx := 0;
for j := 0 to dy div FRACUNIT do //- 1 do
begin
d[idx] := s[j];
idx := idx + SCREENWIDTH;
end;
yy[i] := yy[i] + dy;
s := PByteArray(integer(wipe_scr_start) + i * SCREENHEIGHT);
d := PByteArray(integer(screens[SCN_FG]) + yy[i] div FRACUNIT * SCREENWIDTH + i);
idx := 0;
for j := 0 to SCREENHEIGHT - yy[i] div FRACUNIT - 1 do
begin
d[idx] := s[j];
idx := idx + SCREENWIDTH;
end;
Result := 0;
end;
end;
dec(ticks);
end;
end;
procedure wipe_exitMelt;
begin
Z_Free(yy);
end;
procedure wipe_StartScreen;
begin
wipe_scr_start := screens[SCN_WIPE_START];
I_ReadScreen(wipe_scr_start);
end;
procedure wipe_EndScreen;
begin
wipe_scr_end := screens[SCN_WIPE_END];
I_ReadScreen(wipe_scr_end);
end;
var
wiping: boolean = False;
// when zero, stop the wipe
function wipe_Ticker(ticks: integer): boolean;
begin
// initial stuff
if not wiping then
begin
wiping := True;
wipe_initMelt;
end;
// do a piece of wipe-in
if wipe_doMelt(ticks) <> 0 then
begin
// final stuff
wiping := False;
wipe_exitMelt;
end;
Result := not wiping;
end;
end.